Rotary-cutter head.



G. P. YOUMANS. ROTARY CUTTER HEAD.

APPLICATION FILED JULY 9, 1914. 1,1 1 5,883.

Patented Nov. 3, 1914.

T JI w vweoow I 1 Q f MW HE NORR PETERS C0 PHOTO-TAM. WA HINGTON D c.

1 "NI'IED STATES rarnivr ormon.

P. YOUMANS, OF GALESBURG, MICHIGAN, ASSIGNOR TO KALAMAZOO TANK &

SILO COMPANY, OF KALAMAZOO, MICHIGAN. I

ROTARY-CUTTER HEAD.

Application filed July 9, 1914. Serial Nb. 849,894.

To all whom it may concern: I

Be it known that I, GEORGE P. YOUMANS, a citizen of the United States, residing at Galesburg, Michigan,have invented certain new and useful Improvements in Rotary- Cutter Heads, of which the following is a specification.

This invention relates to improvements in rotary cutter heads.

My improved rotary cutter head is especially designed by me for use in ensilage cutters, such as are illustrated in my appli cation for Letters Patent No. 687,500, filed March 10, 1912, and I have illustrated and described the same embodied in such a structure, although my improvements may be readily adapted for and embodied in other structures.

The cutter heads of rotary cutters-such as ensilage cutters are of considerable size and weight and are driven at high speed. When made of cast iron there is danger. of such heads breaking under the stresses occasioned by the high speed and also there-is a liability of defects in the castings which cannot bediscovered by inspection. Further, such castings, owing to their size and shape,

are liable to crack in cooling and there is liability of forming undesirable stresses in cooling. Attempts to malleableize such castings have not been entirely successful on account of the size which prevents their bemg uniformly malleableized, and also there is liabihty of cracking or weakening 1n the cooling and liability of forming undesirable stresses in cooling. To form such heads of sections and connect the sections by rivets has not heretofore been found entirely successful, for the reason that the rivets are not able to withstand the stresses or if sufiicient rivets to withstand the stresses are employed the parts are weakened to a dangerous extent by the rivet holes. I It is the main object of my present invention to provide an improved rotary cutter head which may be formed of sections of malleableized cast iron and one in which the sections are joined so as to provide a structure of great strength.

A further object is to provide a rotary cutter head having these advantages which is comparatively simple and economical to produce. j

Further objects, and objects relating to from the detailed description to follow.

Specification of Letters Patent.

Patented Nov. 3, 1914.

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims. V I

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which Figure I is a rear perspective view of my improved rotary cutter head. Fig. II is a front perspective view thereof with a single knife mounted thereon. Fig. III is a side elevation of one of thecutter headsections.

Fig. IV is a detail section taken on a line corresponding to the broken line 1- 1: of

Fig.1 g In the" drawing similar reference numerals refer to similarparts in the several views. Referring to the drawing, my improved cutter head, as embodied in the structure illustrated, comprises a pair of substantially duplicate sections 1 having hub openings 2. Each sectionhas at one side of its axial center or hub opening a joint lap extension 3, while at the other sideis a seat 4 adapted to receive the joint lap extension of the other section. The seats are preferably formed by an offset in the body of sections, as shown in the drawing. o i

, The joint extensions are provided with ribs 5, while the seats have grooves 6 in are joined together by rivets 7 arranged on both sides of the ribs, asillustrateda The ribs and grooves, when thus-engaged, re-' lieve the rivets of a large part of the strain thereon, particularly the shearing stress. The ribs and grooves of the'sections are preferably disposed in planes parallel to a plane: through the axis of the head and on opposite sides" thereof. This arrangement, whereby the two joints of the sections are brought out of alinement, is of substantial advantage as it relieves the joint of ,a' good deal of strain-to which it would otherwise be subjected. r a a The hub member is provided with a hub 8 disposedthrough the opening 2: provided therefor-in the sections 1, and with a web portion 9 disposed transversely of the joints of the sections and between the ends of the joint seats thereof. Rivets 7 secure the web portion ofthe hub member to both sections.

The joint member is provided with rib-like arms 10 radiating from the hub and extending beyond the web portion thereof. The ends of the arms are connected to the sections, as by the rivets 7. The hub member thus disposed and connected serves as a reinforcing member as well as a joint or coupling member for the sections. The sections are provided with semi-cylindrical ribs 11 which, when the sections are joined, form a cylindrical rib on the head. The fan blades 12 extend outwardly from these ribs and are supported by the webs 13. The blades 15 are mounted on the face of the head, it being provided with boss-like blade supports 16.

By thus forming the parts they may be readily formed of malleableized iron, it beingpossible to evenly and thoroughly malleableize the same. Further, the sections are not likely to become cracked or subject to undesirable stresses in cooling, either when cast or when subjected to the malleableizing processes. The sections are so effectively joined that they withstand the heavy stresses and strains to which cutter heads are subjected, when driven at high speeds, such as is required in ensilage cutters, shown in my application for Letters Patent before referred to.

Comparatively few rivets are suiiicient to join the parts so that they are not materially weakened by the rivet holes, and the rivets are largely relieved of shearing strain by the co-engaging ribs and grooves of the body sections.

I have illustrated and described my imrovements in detail as embodied by me in cutter heads for ensilage cutters. I have not attempted to illustrate or describe various modifications possible to adapt the same for other purposes, as I believe the disclosure made will enable those skilled in the art to which this invention relates to adapt or embody the same as conditions may render desirable.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A rotary cutter head, comprising a pair of substantially duplicate sections, each having a hub opening and a joint extension at one side of said hub opening and an olfset toprovide a jointextension seat on the opposite side thereof, said joint extensions having ribs on their inner sides, said seats having grooves in which said ribs are disposed, the ribs and grooves being disposed in planes parallel to a plane through the axis of the head and on opposite sides of such plane, said joint extensions being riveted in said seats, there being rivets on both sides vof said ribs thereof, and a hub member' 'disposed transversely of'the joint of said sections and having a hub disposed through said hub openings in'said sections and "a "web portion disposed between the ends of the seats of said sections and riveted to both sections and rib-like arms radiating from its hub, the ends of the arms being riveted to the sections.

2. A rotary cutter head, comprising a pair of substantially duplicate sections, each having a hub opening and a joint extension at one side of said hub opening and an offset to provide a joint extension seat on the opposite side thereof, said joint extensions having ribs on their inner sides, said seats having grooves in which said ribs are disposed, said joint extensions being riveted in said seats, and a hub member disposed transversely of the joint of said sections and having a hub disposed through said hub openings in said sections and a web portion disposed between the ends of the seats of said sections and riveted to both sections and rib-like arms radiating from its hub, the ends of the arms being riveted to the sections.

.A rotary cutter head, comprising a pair of substantially duplicate sections, each having a hub opening and a joint extension at one side of said hub opening and an oifset to provide a joint extension seat on the opposite side thereof, said oint extensions having ribs on their inner sides, said seats having grooves in which said ribs are disposed, the ribs and grooves being disposed in planes parallel to a plane through the axis of the head and on opposite sides of such plane, said joint extensions being riveted in said seats, there being rivets on both sides of said ribs'thereof, and a hub member disposed transversely of the joint of said sections between the, said seats thereof and riveted to both sections.

4:. A rotary cutter head, comprising a pair of substantially duplicate sections, each having a hub opening and a joint extension at one side of said hub opening and an ofiset to provide a joint extension seat on the opposite side thereof, said joint extensions having ribs on their inner sides, said seats having grooves in which said ribs are disposed, said joint extensions being riveted in said seats, and a hub member disposed trans versely of the joint of said sections between the said seats thereof and riveted to both sections.

5. A rotary cutter head, comprising a pair .of sections having joint lap extensions at one side of their axial centers lapping the sides of the other sections, said oint lap extensions having ribs on thelr inner sldes disposed in grooves in the other sections, the

ribs and grooves being disposed in planes parallel to a plane through the axis of the head and on opposite sides of such plane, said lap joint extensions being riveted, there being rivets on both sides of said ribs thereor, and a hub member disposed transversely of the joint of said sections and having a web portion riveted to both sections and riblike arms radiating from its hub, the ends of the arms being riveted to the sections.

6. A rotary cutter head, comprising a pair of sections having joint lap extensions at one side of their axial centers lapping the sides of the other sections, said joint lap extensions having ribs on their inner sides disposed in grooves in the other sections, said lap joint extensions being riveted, and a hub member disposed transversely of the joint of said sections and having a Web portion riveted to both sections and rib-like arms radiating from its hub, the ends of the arms being riveted to the sections.

7. A rotary cutter head, comprising a pair of sections having joint lap extensions at one side of their axial centers lapping the sides of the other sections, said joint lap extensions having ribs on their inner sides disposed in grooves in the other sections, the ribs and grooves being disposed in planes parallel to a plane through the axis of the head and on opposite sides of such plane,

said lap joint extensions being riveted, there 7 being rivets on both sides of said ribs thereof, and a hub member disposed transversely of the joint of said sections and riveted to both sections.

8. A rotary cutter head, comprising a pair of sections having joint lap extensions at one side of their axial centers lapping the sides of the other sections, said joint lap extensions having ribs on their inner sides disposedin grooves in the other sections, said lap joint extensions being riveted, and a hub member disposed transversely of the joint of said sections and riveted to both sections. a

9. A rotary cutter head, comprising a pair of sections having lappedjoints, there being co-engaging ribs and grooves on said sections, the ribs and grooves being disposed in planes parallel to a plane through the axis of the head and on opposite sides of such plane, said lap joint extensions being riveted, there being rivets on both sides of said ribs thereof,'and a hub member disposed transversely of the joint of said sections and riveted to both sections.

10. A rotary cutter head, comprising a pair of sections having lapped joints, there being co-engaging ribs and grooves on said sections, said lap joint extensions being riveted, and a hub member disposed transversely of the joint of said sections and riveted to both sections.

In Witness whereof, I have hereunto so my hand and seal in the presence of two Witnesses.

GEORGE P. YOUMANS. [1 s.] lVitnesses LUELLA G. GREENFIELD, MARGARET L. GLASGOW.

Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. 0. 

